In-situ measurement of twig dieback and regrowth in mature Acer saccharum trees

► One-third of twigs suffered dieback over the course of 1 year. ► Percent dieback increased significantly with stem diameter and slenderness. ► Regrowth decreased significantly with stem diameter. ► Percent dieback was significantly higher in crowns located within 3 m of one another. ► Regrowth was significantly slower in crowns located within 3 m of one another.